Grinder machine



March 22; 1932. R. HERVIG 1,850,349

GRINDER MACHINE Filed Feb. 6, 1950 lNvENToR Packard Herz/9,

ATTORNEYS- Patented hier. 22, 1932 ROLAED l-ERVIG, GF BTTLE CREEK, MICHGAN, ASSIGNOR TO WILCOX-RICI-I CORPORATION, A CORPORATICN F MCHIGAY GRINDER MACEINE Application filed February G, 1930. Serial No. 426,211.

lthough the present invention is broadly entitled, its essential features are particularly pertinent to so-called centreless or roll grinding machines of that general type which has been described and claimed in my pending application, Serial No. QS-l), iilled August 5th, 1.929, to which eference may be had for variousadvangeous features of general construction and iode of operation that need not be herein etailed.

The gresent organization resembles that referred to in its general purposes and also 1n viding for the rotation of a work unit, a tappet valve that is to be ground, by suit ble engagement of a part thereof, such the valve stem, by relatively moving roation-imparting members,-these being dis posed one within the other about axes which are so related as to provide conv-ergent peripheral surfaces, and an additional surface, preferably provided 0r carried by a so-called steady rest, being employed to oppose the action of gravity upon the work unit; and the main advance upon whichprotection is herein sought is such a relative disposition of the mentioned surfaces as to obviate any jumping or other vertical or periph-y erial displacement of the work unit.

More specifically, the present invention, in a preferred embodiment thereof, may involve not only a lateral offsetting, but a vertical oii'setting of an axis of curvature and/or rotation of an inner rotation-imparting member (preferably in the form of a drum) relatively to the axis of the cooperating outer member, the effect being that, in the imme diate region of their contact with the valve stem (or a corresponding part of any work unit,--assumed to be substantially cylindrical, in case the rotation-imparting surfaces are cylindrical) any convergence of said surfaces is upward, rather than downward.

Other objects of the present invention (in connection with which it should be understood that either the operating and control devices of the mentioned application or any preferred operating and control device may be employed, and that the mentioned surfaces may, if desired, serve for both a rotating and 'wenn gn 'i a surface-perfecting effect) will bebest understood from the following description of an illustrative embodiment of the invention, talren in connection with the appended claims and the accompanying drawings.

f Fig. l is a front or end elevational view; and Fig 2 is a small-scale plan view, diagrammatically showing the general relationship of the main parts herein described to a grinding wheel and its associated parts.

ln general, the machine selected for de-` scription and shown in the drawings comprises a pair of cylinders or drums, differing in radius of curvature, both being arranged for rotation and the smaller drum being preferably designed to rotate within the larger end in a direction opposite to the direction of rotation of said larger drum. The internal surface of the larger drum may be provided with a friction element, such as a lining formed of a hard rubber composition; and the exterior surface of the smaller drum may be equipped with a grinding face (if a grinding operation is intended to be performed by its engagement with a worlr unit) or withv merely a friction face similar to that provided within the outer drum. The cylin ders are positioned with their surfaces in suiliciently close proximity to one another in one region to enable both of them to contact with a part of a work unit, such as a valve stem. An additional member, providing a worlrsupport, may be interposed between the surfaces of the mentioned cylinders in the mentioned region, the Contact of the oppositely rotating drums with the work unit being relied upon to cause the same to revolve about its own axis while contacting with a flat or rounded hard upper surface of said work support; and the machine may obviously be utilized merely to rota-te the stem of the valve while the head is being ground, or it may be equipped, as above suggested, to grind the stem simultaneously wtih the head grinding operation,-the lixity of the axis of rotation of the work unit being importantin either case and assured by the mentioned ofi'- setting of the axis of curvature of the inner drum or its equivalent.

Referring to Fig. l, a suitable base casting 10, remote from the observer, may be secured to the bed of any suitable supporting table orvbencliV and may provide a fore-and-aft aperture in which is suitably journaledr a shaft 12. Keyed to and supported by an end of the shaft 12 is shown al small drum 15; and

` driving ypower may be applied directly or in- Vdrum-supporting casting 2() may be to some suitable part of the shaft 12'. of shaft 12 to be fiXed,a provided directly Assuming the axis with any desired lateral adjustment means,

. faces for a y Y centralk `part of thek drum 30 and preferably such asa tongue and groove connection', as suggested at 21, extending in a direction at kright angles to the line of the shaft 12,--they casting havingpreferably the general form of a ring 22 supported upon a flat base. The internal peripheryl ofthe ring 22 of the casting 20 is provided with suitablebearing surlarge Vdrum 30. Fitted vupon the purpose being suggested by dotted lines 45.

Africtionl lining of' hard rubber com- Losition, or the like, to provide a rotationimparting surface, is shown as securedy to the inner periphery of the large drum 30 by means ofa. shouldered ring51, a cooperating lining 6() being preferably providedupon the external. periphery of the small drumfl and secured thereon by means such as a shouldered ring. 61Y i The linings V50y and 60 may be of like composition if it is .desiredV only to rotate the valve stem rather than to grind it. If, however, it is desired to grind the stem or to polishfit, one or both.` of the ymentioned linings may naturally be formed from a material ably advanced.

suitable'to this purpose; and, in any case, some"` rotative effect may obviously be, ob'- tainedl even though only oneof the mentioned drums, orequivalent members, be provided' with a rotation-imparting surface and suit- A.work support may comprisel an arcuate sheath for a part ofthe small drum 15,'and

kalso bored-out end portions suoli as that shown at. 70, by which it may be supported,-

5 theforwa'rd end portion being yadapted to fitV arounda shouldered bushing 72 on the end of shaftl12 in front of drum 15, and means such as a washer 73 and a nut 7 21 being c1npl'loyed on the end ofk said shaft.V to secure said bushing/and thereby said work support, in place. The righty edge 76 of the arcuate por tion.k of]I the Vwork-supportingv ymember provides a surface interposed between the nientioned surfaces, upon which the stemof a valve 100, or other work unit is supported,

room for the head of the valverbeing provided by a cutting away of said sheath at 77. The Y forward end portion is shown as provided with a spider portion or web 78, having an elongated slot 79 in the end thereof, to receive a bolt 80' secured iiia bracket 81 upon the supporting bench 5,-a nutk 82 ybeing tightened against the spider 7 8 to secure the work supporting member in any adjusted position.V 1 ,j

Any suitable mechanism may be employed Vte vary'the distance between mentioned sur- Y faces, as .by resiliently advancing and/or manually shifting the large drum 30 relatively to' the small drum 15 and the work support, yto permit engagement and' easy removal of work units of various diameters. F or example, in the base ofthe casting 20, there may be secured a plurality ofpins which. extend through the ends of an aper-v 1 tured bracket 123,secured to the bench 5; and compression springs'124 maybe so po` sitioned upon the said Vpins as to abut at one end against the bracket 123' and at the 'other' end against nuts 125, adjustable upon the free ends of said pins. The springs 124' may be so tenesionedY by the nut-s 125 as normally to maintain the large drum 30 inoperative position relative tothe work support and the small'drum 15. the casting 20, in ay bifurcate bracket" 126, is shown a rolle-11,127, positionedV above and bef tween pins 120. Secured to the bench 5 and Secured in the left side of between the piiis`1-20lis a bearing member 130,

in which is journaled a shaft 131. Secured to the shaft 131,5totlie right of the bearing 130, is a cam 132' with its face in operative contact with the roll 127 and'A secured to the cam 132 there is shown a lever 133', by which the cani may 4be manually' rocked with the 1I 3 shaft 131 in vtliebearing 130 to force tlie'cast ingf2'0, and therewitli'tlie drum 30, Vto the y right in opposition to the pressureof springs 124 but it should be understood that all feavturesabove referred to, being among those 32E.;

described in the viiientiniied application, are

herein setk forth for the sake ofclarity and completeness of description only; and also Y that the outer member, whether or not it has the form of a drum, may always have a greater radius ofcurvature than the inner member in the region of nearest approach between said members.Y

It will be observed that the described specific arrangement of the means for rotating the drum 30 will cause it to advance in a direction opposite to the rotation of the shaft 12 and thedrum 15, and the gearing mayY be such ythat the small drum 15 rotates downwardlyA toward thework-supporting surface 7 6' at a greater speed than the outer drum 30 rotates; upwardly in order to minimize any tendency yfor the work to leave the surface 7 6, and., in the present instance, the construction and arrangement'of mentioned parts is a line common to an inclined radius of drumy l5, if extended, and a horizontal radius of drum 30,*this novel construction having the notable advantage that a local substantial paralelism, or a slight upward convergence,

en i

of the cooperating rotation-imparting surfaces serves substantially to obviate rislr of any jumping or climbing movement of the work during grinding yor other operation, so long as both the laterally disposed surfaces, shown as having unlike curvatures contact therewith.

This combination permits the grinding wheel 110 to be of an inexpensive type, and rotated by any preferred means; and, the general mode of operation of this machine having been indicated in connection with the foregoing description, it may be noted, inl conclusion, 'that power can be applied to either shaft l2 or shaft el, and that the use i of the present innovations involves no complications in design, although the organization retains all advantages, such as accessibility of essential parts, ease of feed and rapidity of action, mentioned in the prior application referred to, while additionally insuring asteadier retention of the work units than was originally provided for.

All forms of the invention may involve the use of inner and outer drums, or equivalent members, respectively providing relatively movable lateral surfaces, at least one of said surfaces being of such material as to impart rotation to a work unit disposed therebetween, means for advancing at least one of said surfaces, an interposed member providing an additional unit-engaging surface between the mentioned surfaces, and means for so supporting said members as substantially to prevent disengagement of said unit from any of said surfaces during rotation thereof,*this being preferably accomplished by so disposing centres of curvature and/or rotation as to render cooperating surfaces upwardly convergent in the region of their engagement of said unit, the angles between lines of engagement of said surfaces with said unit being always lessI than 180. in other words the line contacts between the unit and the drum 30, drum and support 7 6 are on a greater than semi-cylindrical surface of the unit. Also the line contacts of the drums and unit are spaced less than 180 degrees about the upper surface of the unit.

It should, however, be understood that various features of the described organization might be independently used and that the unit to which rotation is imparted may have any desired general form or function, so long as an engaged part such as the mentioned stem, or its equivalent, is, or becomes,y

substantially circular in cross-section; and also that various special modifications and applications of the principles involved might easily be devised by workers skilled in the pertinent arts, if informed of the foregoing, ll without departure from the scope of the present invention as the latter is indicated by the following claims:

l. Ina work-rotating mechanism of the general character described: an inner memer which lprovides a convex surface for the engagement of a unit to be rotated; an outer member whose inner surface has a radius of curvature which exceeds that of said convex surface,-at least one of said members having its surface formed of a material which adapts it to impart rotation to the mentioned unit; means for relatively advancing the' last mentioned member; an interposed member providing an additional unit-engaging surface between the mentioned surfaces; and means for so supporting said members as substantially to prevent disengagement of said unit fr-om any of said surfaces `during rotation thereof.

2. In a work-rotating mechanism of the general character' described: an inner member which provides a convex surface for the engagement of a unit to be rotated; an outer member whose inner surface has a radius of curvature which exceeds that of said convex surface,-at least one of said members having its surface formed of a material which adapts it to impart rotation to the mentioned unit; means for relatively advancing the last mentioned member; an interposed member providing an additional unit-engaging surface between the mentioned surfaces; and means for so supporting said members as substantially to prevent disengagement of said unit from any of said surfaces during rotation thereof,-the respective inner and outer members being drums whose axes are relatively offset in both a horizontal direction and a vertical direction.

3. In a work-rotating mechanism of the general character describedran inner member whichv provides a convex surface for the engagement of a unit to be rotated; an outer member whose inner surface has a radius of curvature which exceeds that of said convex surface,-at least one of said members having its surface formed of a material which adapts it to impart rotation to the mentioned unit; means for relatively advancing the last mentioned member; an interposed member providing an additional unit-engaging surface between the mentioned surfaces; and means for so supporting said members as substantially to prevent disengagement of said unit from any of said surfaces during rotation thereof,the respective inner and outer members being drums whose axes are relatively offset in both a horizontal direction and a verticali direction,A said Aconcave surfacey and saidcoiifvexr surface beingl iupwa-rdlyk couvern 'gent in theregionl of their engagement vof said i unit,l and the ymentionedsurface of: the interposedmember being below said unit.

y 4L InterWorks-rotating mechanism of thel general.' character described: an inner member which; provides a convex surface for the en* ygagement of a unit to be rotated; rany outer member whoser innersurface yhas a radius of curvature which exceeds that of said convex suriname-atleast oneof said members hav- 'mgviiatss surface formed Vof ak material which adaptsittoimpart rotation to the mentionedl f unit means for relatively advancing` the last mentioned member;V an interposed member. providing an additional unit-engaging surfaeenbetween vthe mentioned surfaces; and

f means:forse-supportingv said members as substantially to. prevent disengagenientof said unit from: any of'said surfaces during rotation thereon-fthev respective inner and outer members; being drums Whose axes are relae ing surface;

for rotation but eccentrically positioned Within` the mentioned drum; common driving nieansfor said drums; and means for prevent-ing peripherial displacement, in either di- V rection, of yal Work unit interposed between said drums. i n

6'; In'ameans for rotating a Work unit, a convexmovable member,a concave movable memberand' a stationary member, respectively engaging said`iunit,said members engaging the unit atp'oints cylindrical surface of the unit.

71. Inmeans for rotating a cylindrical Work unit, a convexvivmovable member, a concave movable. member, and a stationaryV member,

Y respectively engaging said unit, said'members engaging the unit yat points locatedv on a greaterthan semi-cylindrical surface of the unit, atleast one of the first mentioned membersbeing: provided with a surface When advanced toward the unit to impart rotation thereto, and'means for moving said members toward or from each other.

8'. Inameans for rotating a cylindrical Work for rotating the drum, a second drum disposed Within' the first 1drum,eccentrically thereof, a

`work support disposed between the outer surface ofthe innerdrum and the inner surface Y of the cuter drum, the support being so located thatthe adjacent surfaces of the drums extend upward-ly beyond the sides of the work support in only Vconverging relation.

=1l0.f In-combinationarotatabledrum,means l for rotatingthe drum, -a second drum disposed within the first 'drum' eccentrically thereof, a. Work support disposed between the outer surface of the inner drum and theinner surfaceof the outer drum, the support being so located that the adjacent surfaces of the drums are adapted to contact Withacylinydrica-l'unity supported on the Work supportA at points spaced lessthan 180?` around the surface of the work piece opposite the support.y e Y f e,

11;. yIn combinationl a rotatable drum, means forl rotating tliegdrum, a seconddrum disposedadjacent the first drum, a work support disposed between adjacent peripheral surfaces of the drums, the arrangement being such that a cylindrical `lvvorli'r piece supportedy on the support engages theilatter and the surfaces of the drums located on a greater than semi-cylindrical surface of the Work piece.

RICHARD -HERVIG.

a second drum* alsol supported Y Y( located on a greater than semiunit, avconveX movable member, and a cone cave; movable member respectively engaging said; unit,the points 'of engagement of said members to saidl unit being located on a f greater than semi-'cylindrical surface of the unit', said members comprising drums Whose axesl arev relativelyoifset both horizontally and vertically. v

9.1 In'oombination, arotatable drum, means 

